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Albemarle Corporation

Franciscus Wilhelmus Houtert

Sonja Eijsbouts

Frans Lodewijk Plantenga

Marcel Adriaan Jansen

Tetsuro Kamo

The present invention pertains to a process for regenerating and rejuvenating an additive-based hydrotreating catalyst containing Group VIB and Group VIII hydrogenation metals. The process comprises the steps of regenerating the catalyst by contacting it with an oxygen-containing gas at a maximum temperature of 500&#xb0; C., followed by rejuvenating the catalyst by contacting it with an organic additive comprising an organic compound, other than a compound that the catalyst is contacted with in the course of its use as a catalyst prior to regeneration and rejuvenation. The organic additive is incorporated into the catalyst. If necessary, the catalyst may then be dried at such a temperature that at least 50% of the additive is maintained in the catalyst. The process according to the invention makes it possible to restore the activity of a used additive-based hydrotreating catalyst to its original level, or even to improve it to above that level.

Process for regenerating and rejuvenating additive-based catalysts

The present invention pertains to a process for regenerating a used additive-based catalyst comprising the step of regenerating the catalyst by contacting it with an oxygen-containing gas at a maximum temperature of 500&deg; C. Preferably, the maximum catalyst temperature during the regeneration step is 300-500&deg; C., more preferably 320-475&deg; C., even more preferably 350-425&deg; C. The regenerated additive-based catalyst obtained with the process according to the invention has a higher activity than an additive-based catalyst regenerated at a higher temperature. Additionally, its activity is also higher than that of a corresponding catalyst, which never contained an additive.

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Landsmeer, Netherlands

Franciscus Wilhelmus Houtert